104 lines
3.1 KiB
JavaScript
104 lines
3.1 KiB
JavaScript
function warn_or_throw(wrn, msg) {
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if(wrn) { if(typeof console !== 'undefined') console.error(msg); }
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else throw new Error(msg);
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}
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function parse_zip(file/*:RawBytes*/, options/*:CFBReadOpts*/)/*:CFBContainer*/ {
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var blob/*:CFBlob*/ = /*::(*/file/*:: :any)*/;
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prep_blob(blob, 0);
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var FileIndex/*:CFBFileIndex*/ = [], FullPaths/*:Array<string>*/ = [];
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var o = {
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FileIndex: FileIndex,
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FullPaths: FullPaths
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};
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init_cfb(o, { root: options.root });
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/* find end of central directory, start just after signature */
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var i = blob.length - 4;
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while((blob[i] != 0x50 || blob[i+1] != 0x4b || blob[i+2] != 0x05 || blob[i+3] != 0x06) && i >= 0) --i;
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blob.l = i + 4;
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/* parse end of central directory */
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blob.l += 4;
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var fcnt = blob.read_shift(2);
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blob.l += 6;
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var start_cd = blob.read_shift(4);
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/* parse central directory */
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blob.l = start_cd;
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for(i = 0; i < fcnt; ++i) {
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/* trust local file header instead of CD entry */
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blob.l += 20;
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var csz = blob.read_shift(4);
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var usz = blob.read_shift(4);
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var namelen = blob.read_shift(2);
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var efsz = blob.read_shift(2);
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var fcsz = blob.read_shift(2);
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blob.l += 8;
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var offset = blob.read_shift(4);
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var EF = parse_extra_field(/*::(*/blob.slice(blob.l+namelen, blob.l+namelen+efsz)/*:: :any)*/);
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blob.l += namelen + efsz + fcsz;
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var L = blob.l;
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blob.l = offset + 4;
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parse_local_file(blob, csz, usz, o, EF);
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blob.l = L;
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}
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return o;
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}
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/* head starts just after local file header signature */
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function parse_local_file(blob/*:CFBlob*/, csz/*:number*/, usz/*:number*/, o/*:CFBContainer*/, EF) {
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/* [local file header] */
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blob.l += 2;
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var flags = blob.read_shift(2);
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var meth = blob.read_shift(2);
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var date = parse_dos_date(blob);
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if(flags & 0x2041) throw new Error("Unsupported ZIP encryption");
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var crc32 = blob.read_shift(4);
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var _csz = blob.read_shift(4);
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var _usz = blob.read_shift(4);
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var namelen = blob.read_shift(2);
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var efsz = blob.read_shift(2);
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// TODO: flags & (1<<11) // UTF8
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var name = ""; for(var i = 0; i < namelen; ++i) name += String.fromCharCode(blob[blob.l++]);
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if(efsz) {
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var ef = parse_extra_field(/*::(*/blob.slice(blob.l, blob.l + efsz)/*:: :any)*/);
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if((ef[0x5455]||{}).mt) date = ef[0x5455].mt;
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if(((EF||{})[0x5455]||{}).mt) date = EF[0x5455].mt;
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}
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blob.l += efsz;
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/* [encryption header] */
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/* [file data] */
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var data = blob.slice(blob.l, blob.l + _csz);
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switch(meth) {
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case 8: data = _inflateRawSync(blob, _usz); break;
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case 0: break;
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default: throw new Error("Unsupported ZIP Compression method " + meth);
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}
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/* [data descriptor] */
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var wrn = false;
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if(flags & 8) {
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crc32 = blob.read_shift(4);
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if(crc32 == 0x08074b50) { crc32 = blob.read_shift(4); wrn = true; }
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_csz = blob.read_shift(4);
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_usz = blob.read_shift(4);
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}
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if(_csz != csz) warn_or_throw(wrn, "Bad compressed size: " + csz + " != " + _csz);
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if(_usz != usz) warn_or_throw(wrn, "Bad uncompressed size: " + usz + " != " + _usz);
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var _crc32 = CRC32.buf(data, 0);
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if(crc32 != _crc32) warn_or_throw(wrn, "Bad CRC32 checksum: " + crc32 + " != " + _crc32);
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cfb_add(o, name, data, {unsafe: true, mt: date});
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}
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